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Flight-Time Method Modified: Development of a Novel and More Accurate Method for Measuring Vertical Jump Height Using
Takuya Nishioka1, Shota Yamaguchi1, Takayuki Inami1
1Institute of Physical Education, Keio University, Yokohama, Japan.
International Journal of Sports Physiology and Performance
|November 5, 2024
Summary
A new modified flight-time method (FTM) accurately measures vertical jump height (JH) by accounting for lower limb flexion. This reliable and valid field method offers a convenient, low-cost alternative to traditional flight-time measurements.
Area of Science:
- Biomechanics
- Sports Science
- Human Movement Analysis
Background:
- The flight-time method (FT) is a convenient field technique for measuring vertical jump height (JH).
- FT can overestimate JH due to lower limb flexion during landing.
- A validated and reliable method is needed to address this limitation.
Purpose of the Study:
- To introduce and evaluate a modified flight-time method (FTM) for measuring vertical jump height (JH).
- To assess the validity and reliability of FTM compared to traditional FT and impulse-momentum (IM) methods.
- To determine if FTM accurately measures JH, even with lower limb flexion at landing.
Main Methods:
- Twenty-four male participants performed countermovement jumps.
- Jump height was measured using force plates (1000 Hz), high-speed smartphone video (240 fps), and the proposed FTM.
- FTM utilized smartphone-based marker tracking of the greater trochanter for flight time and JH calculation.
Main Results:
- FT significantly overestimated JH compared to the impulse-momentum (IM) method (P < .001).
- FTM showed no significant difference from IM for JH calculation.
- FTM demonstrated a strong, near-perfect correlation (ρ = .987) with IM and high reliability, outperforming FT (ρ = .882).
Conclusions:
- The modified flight-time method (FTM) offers superior concurrent validity and high reliability for measuring countermovement jump height.
- FTM accurately measures JH by mitigating the overestimation caused by lower limb flexion.
- FTM presents a convenient, low-cost, and more valid field-based alternative for practitioners to assess vertical jump performance.
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